UPDATE: In a Tuesday morning news conference, Sheriff William Snyder identified the suspect as 19-year-old Florida State University student, Austin Harrouff.
Snyder called the incident an "unprovoked random attack on victims sitting in their garage."
The victims, identified as John Joseph Stevens III and Michelle Karen Mishcon, did not know Harrouff, according to the sheriff.
Snyder said Harrouff gave a false name when he was arrested, which slowed their investigation.
WATCH the full news conference below:
EARLIER STORY: The Martin County Sheriff’s Office said a husband and wife are dead, and a neighbor was seriously injured, after a violent and gruesome attack Monday night.
The attack happened at 19000 SE Kokomo Lane, just off of SE Island Way, at 9:20 p.m.
MCSO said it received a call from a neighbor saying he’d been stabbed as he was trying to break up a fight.
The first deputy to arrive found the suspect, who identified himself as Austin Michael Moore, on top of the male victim in the driveway.
The suspect was biting and removing pieces of the victims face with his teeth, MCSO says.
The deputy tried to remove the suspect, using a stun gun, but it had no effect.
A K-9 arrived, biting the suspect, but was still unable to get him off the victim.
MCSO says deputies were eventually able to pry the suspect off and take him into custody.
The wife of the husband was found inside of the garage, deceased.
The neighbor, identified by his father as Jeff Fisher, 47, was rushed to Good Samaritan hospital, and is in surgery. He is expected to survive. Fisher's father said his son tried to stop the attack.
Deputies are working to confirm the identity of the suspect because they believe he provided a false identity to them.
An associate of the suspect has been located and she is being questioned.